// pages/cansai/cansai.js
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     * 生命周期函数--监听页面初次渲染完成
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     * 生命周期函数--监听页面显示
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     * 生命周期函数--监听页面隐藏
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     * 生命周期函数--监听页面卸载
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     * 页面相关事件处理函数--监听用户下拉动作
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     * 页面上拉触底事件的处理函数
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